using factorial in probability question
09-27-2017, 02:31 AM
Post: #1
 resolved Member Posts: 55 Joined: Jun 2014
using factorial in probability question
software version 10024
hardware version C

I will update later -- calculator just purchased a few days ago

Problem: what is the probability of 2 people having the same birthday amongst 30 people???

Solution: 1 - 365! / ((365-30)!*365^30) = 0.706316

my answer on the HP Prime is +inf --- not good
in HOME the highest factorial I can get is 253! before it max out
in CAS the highest factorial I can get is 170! before I get +inft

in HOME 365! / 253! i get 0
365! / 252! i get 489.03

In CAS 365! / 252! i get a huge number several 100 digits long

how can I solve this problem on the HP Prime????
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 Messages In This Thread using factorial in probability question - resolved - 09-27-2017 02:31 AM RE: using factorial in probability question - chromos - 09-27-2017, 03:25 AM RE: using factorial in probability question - Tim Wessman - 09-27-2017, 04:49 AM RE: using factorial in probability question - resolved - 09-27-2017, 04:32 AM RE: using factorial in probability question - resolved - 09-27-2017, 04:39 AM RE: using factorial in probability question - Tim Wessman - 09-27-2017, 04:50 AM RE: using factorial in probability question - resolved - 09-27-2017, 05:26 AM RE: using factorial in probability question - Joe Horn - 09-27-2017, 07:28 AM RE: using factorial in probability question - lost2 - 09-27-2017, 05:21 PM RE: using factorial in probability question - toshk - 09-27-2017, 05:57 PM RE: using factorial in probability question - Arno K - 09-27-2017, 07:28 AM RE: using factorial in probability question - Paul Dale - 09-27-2017, 09:16 AM RE: using factorial in probability question - ggauny@live.fr - 09-29-2017, 06:36 PM RE: using factorial in probability question - resolved - 10-02-2017, 04:13 AM RE: using factorial in probability question - Joe Horn - 10-02-2017, 05:48 AM RE: using factorial in probability question - chromos - 10-02-2017, 08:49 AM RE: using factorial in probability question - Joe Horn - 10-02-2017, 12:07 PM RE: using factorial in probability question - Tim Wessman - 10-02-2017, 02:42 PM RE: using factorial in probability question - Joe Horn - 10-02-2017, 08:48 PM RE: using factorial in probability question - toml_12953 - 10-02-2017, 11:45 AM RE: using factorial in probability question - Tim Wessman - 10-03-2017, 12:40 AM RE: using factorial in probability question - AlexFekken - 10-03-2017, 02:44 AM RE: using factorial in probability question - resolved - 10-03-2017, 06:17 AM RE: using factorial in probability question - pier4r - 10-03-2017, 07:43 AM RE: using factorial in probability question - chromos - 10-03-2017, 08:58 AM RE: using factorial in probability question - resolved - 10-03-2017, 09:31 AM RE: using factorial in probability question - pier4r - 10-03-2017, 09:59 AM RE: using factorial in probability question - luckybuck - 02-02-2019, 05:21 AM

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